WO2017081917A1 - Dispositif de stockage d'électricité - Google Patents

Dispositif de stockage d'électricité Download PDF

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Publication number
WO2017081917A1
WO2017081917A1 PCT/JP2016/076155 JP2016076155W WO2017081917A1 WO 2017081917 A1 WO2017081917 A1 WO 2017081917A1 JP 2016076155 W JP2016076155 W JP 2016076155W WO 2017081917 A1 WO2017081917 A1 WO 2017081917A1
Authority
WO
WIPO (PCT)
Prior art keywords
case
lid
side mating
welded portion
mating surface
Prior art date
Application number
PCT/JP2016/076155
Other languages
English (en)
Japanese (ja)
Inventor
厚志 南形
雅人 小笠原
智明 立花
孝 筒井
Original Assignee
株式会社 豊田自動織機
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社 豊田自動織機 filed Critical 株式会社 豊田自動織機
Priority to US15/774,215 priority Critical patent/US20180331331A1/en
Priority to DE112016005140.9T priority patent/DE112016005140B4/de
Priority to CN201680065077.4A priority patent/CN108352465A/zh
Priority to JP2017550010A priority patent/JP6760302B2/ja
Publication of WO2017081917A1 publication Critical patent/WO2017081917A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
    • H01M50/103—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/147—Lids or covers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/183—Sealing members
    • H01M50/184—Sealing members characterised by their shape or structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a power storage device including a case having a welded portion.
  • a case of a sealed battery (secondary battery) in Patent Document 1 includes an aluminum case main body member (case main body) that houses an electrode body (electrode assembly), and a seal that closes an opening of the case main body member.
  • the electrode assembly has positive electrodes and negative electrodes stacked alternately. As the charging / discharging of the electrode assembly is repeated, the electrode assembly repeatedly expands and contracts in the electrode stacking direction. Thereby, stress in the stacking direction of the electrode assembly is repeatedly generated in the case. Further, when gas is generated in the case due to the reaction between the electrolytic solution and the active material, the internal pressure of the case rises and stress is generated in the case. Therefore, in the secondary battery, stress is also generated in the welded part of the case due to repeated charging / discharging of the electrode assembly or an increase in the internal pressure of the case, and the welded part may be damaged.
  • a power storage device for solving the above problems is a power storage device including an electrode assembly and a case for housing the electrode assembly, wherein the case includes a cylindrical case body having a bottom wall and an opening. A lid that closes the opening, the case body has a case-side mating surface that contacts the lid, and the lid has a lid-side mating surface that faces the case-side mating surface.
  • the case has a welded portion at a butted portion, which is a portion where the case side mating surface and the lid side mating surface are butted, and connects the bottom wall of the case body and the lid at the shortest distance.
  • the welded portion When the direction is the extending direction of the case, in the cross-sectional view of the case along the extending direction, the welded portion has an interface existing at the boundary between the case body and the lid, and the case The melt exposed from the outer surface of The maximum dimension from the surface of the part to the interface is the welding depth X, and the dimension from the butted part to the edge of the welded part in the direction along the surface of the welded part exposed from the outer surface of the case Is a welding width Y, the welded portion is configured to exist over the entire circumferential direction of the case in a shape satisfying the following formula Y / X> 1.
  • the welded portion is configured such that the weld width Y is greater than the weld depth X at any location in the circumferential direction of the case.
  • a welded portion is assumed in which the welding depth X is the same as that of the present configuration and the welding width Y is smaller than the welding depth X.
  • the welded part of this configuration can make the length of the interface of the welded part longer than the comparative example. As the length of the interface increases, the volume of the welded portion increases, and the load per unit area applied to the welded portion can be reduced from the comparative example, and the strength of the welded portion can be increased as compared with the comparative example.
  • the welding depth X is a dimension at the case-side mating surface and the lid-side mating surface, and the interface passes through the abutting portion, and the case-side mating surface and the lid It is preferably perpendicular to the body side mating surface.
  • the interface in a cross-sectional view along the extending direction, when the interface passes through the abutting portion and is oblique to the case side mating surface and the lid body side mating surface, the interface forms the both mating surfaces.
  • the smaller the angle the shorter the weld width and the shorter the interface length.
  • the welded portion has a first edge exposed from the outer surface of the lid and a second edge exposed from the outer surface of the case body, and the interface includes the first edge and the second edge. It is preferable to extend in the shape of a circular arc.
  • the interface When the interface is bent in the vicinity of the case side mating surface and the lid body side mating surface, the interface obliquely intersects the case side mating surface and the lid body side mating surface in a sectional view along the extending direction of the case. .
  • the interface since the interface extends in an arc shape between the edges on both sides of the welded portion, it is possible to suppress the weld width from being shortened and increase the strength of the welded portion.
  • the welded portion has a semi-elliptical shape that is long in the extending direction in a cross-sectional view of the case along the extending direction.
  • the case body includes a peripheral wall having an opening end surface surrounding the opening and an outer peripheral surface, the opening end surface includes the case side mating surface, and the lid body includes An inner end surface having a lid-side mating surface and an outer peripheral surface surrounding the inner end surface, and the surface of the welded portion is exposed from the outer peripheral surface of the peripheral wall and the outer peripheral surface of the lid, and the welded portion
  • the welding depth is a dimension in the thickness direction of the peripheral wall.
  • the welding width can be secured in the extending direction of the case, and the welding depth can be secured in the thickness direction of the peripheral wall of the case body. Therefore, it is not necessary to secure the welding width in the thickness direction of the peripheral wall of the case main body, and it is possible to avoid the energy density of the power storage device from being lowered by increasing the thickness of the peripheral wall.
  • the electrode assembly has a plurality of stacked electrodes of different polarities, and the power storage device is one of a plurality of power storage devices constrained in a state of being arranged in the stacking direction of the electrodes.
  • the power storage device is one of a plurality of power storage devices constrained in a state of being arranged in the stacking direction of the electrodes.
  • the electrode assembly repeats expansion and contraction in the stacking direction by repeated charging and discharging of the electrode assembly.
  • the power storage device is constrained in the stacking direction of the electrode assembly, deformation of the case due to the load due to expansion and contraction of the electrode assembly is suppressed, and the welded portion is not easily damaged in the stacking direction of the electrode assembly.
  • the internal pressure of the case rises, since the deformation of the electrode assembly in the stacking direction is suppressed, the load applied to the case in the extending direction is not suppressed, and the cover body The load is applied in the direction away from the case body.
  • the welding width along the extending direction of the case is ensured to be long and the length of the interface is also long, the welded portion is not easily damaged in the direction in which the lid is separated from the case main body.
  • the case body includes a peripheral wall having an opening end surface surrounding the opening and an inner peripheral surface including the case side mating surface
  • the lid body includes an outer end surface and the outer end surface.
  • an outer peripheral surface having a lid-side mating surface, and the surface of the welded portion is exposed from the opening end surface and the outer end surface, and the welding depth of the welded portion is determined by the extending direction. It is the dimension in.
  • the electrode assembly repeatedly expands and contracts by repeatedly charging and discharging the electrode assembly.
  • the welding width is ensured long in the stacking direction of the electrode assembly and the length of the interface is also long, the welded portion is hardly damaged.
  • the case body and the lid body May be configured to satisfy the following formula D> D1.
  • the weld width of the welded portion can be ensured longer in the extending direction of the case by making the thickness D of the lid thicker than the thickness D1 of the peripheral wall, sufficient welding strength can be ensured without increasing the thickness of the peripheral wall. For this reason, the fall of the energy density of the electrical storage apparatus by increasing the thickness of a surrounding wall is not caused.
  • the power storage device is, for example, a secondary battery.
  • the strength of the welded part of the case can be increased.
  • the fragmentary sectional view which shows the welding part in the case of 6th Embodiment The fragmentary sectional view which shows the welding part in the case of 7th Embodiment.
  • a secondary battery 10 as a power storage device includes a case 11 in which an electrode assembly 12 is accommodated.
  • the case 11 includes a rectangular parallelepiped case main body 13 having a bottom wall 13 a and an opening S, and a rectangular flat lid 14 that closes the opening S of the case main body 13.
  • the case main body 13 has a rectangular tube shape. Both the case body 13 and the lid body 14 are made of metal (for example, stainless steel or aluminum).
  • the secondary battery 10 of the present embodiment is a prismatic battery having a rectangular (cuboid) appearance.
  • the secondary battery 10 of the present embodiment is a lithium ion battery.
  • the electrode assembly 12 has a plurality of positive electrodes 12a, a plurality of negative electrodes 12b, and a plurality of separators 12c, and each separator 12c insulates each positive electrode 12a from each negative electrode 12b.
  • Each positive electrode 12a has a rectangular shape having a long side and a short side, and includes a positive electrode metal foil (for example, an aluminum foil) and a positive electrode active material layer that is disposed on both surfaces of the positive electrode metal foil and includes a positive electrode active material.
  • a positive electrode metal foil for example, an aluminum foil
  • a positive electrode active material layer that is disposed on both surfaces of the positive electrode metal foil and includes a positive electrode active material.
  • Each negative electrode 12b has a rectangular shape having a long side and a short side, and has a negative electrode metal foil (for example, a copper foil) and a negative electrode active material layer that is disposed on both sides of the negative electrode metal foil and contains a negative electrode active material. .
  • a negative electrode metal foil for example, a copper foil
  • a negative electrode active material layer that is disposed on both sides of the negative electrode metal foil and contains a negative electrode active material.
  • the positive electrode 12a and the negative electrode 12b are alternately stacked along one direction so that the active material layers of the adjacent positive electrode 12a and the negative electrode 12b face each other, and both the adjacent electrodes It has a laminated structure in which a separator 12c is interposed between 12a and 12b.
  • the separator 12c is a microporous film.
  • the stacking direction W of the electrode assembly 12 having a stacked structure is a direction in which the active material layers of the positive electrode 12a and the negative electrode 12b face each other.
  • the positive electrode tab 18 protrudes from the edge of each positive electrode 12a, and the negative electrode tab 20 protrudes from the edge of each negative electrode 12b.
  • the secondary battery 10 includes a metal positive electrode conductive plate 19 joined (for example, welded) to a group of positive electrode tabs 18, a metal negative electrode conductive plate 21 joined (for example, welded) to a group of negative electrode tabs 20, and Have The positive electrode conductive plate 19 is electrically connected to the positive electrode terminal 15 exposed outside the case 11 from the lid body 14, and the negative electrode conductive plate 21 is exposed to the negative electrode terminal 16 exposed outside the case 11 like the positive electrode terminal 15. And are electrically connected. Thereby, the electrode assembly 12 is electrically connected to each of the positive electrode terminal 15 and the negative electrode terminal 16.
  • the lid 14 has a pressure release valve 17.
  • the pressure release valve 17 is opened when the pressure in the case 11 reaches an open pressure that is a predetermined pressure so that the pressure in the case 11 does not increase too much, and the inside and outside of the case 11 are communicated.
  • the release pressure of the pressure release valve 17 is set to a pressure at which the pressure release valve 17 can be broken before the case 11 itself or the case main body 13 and the lid body 14 are cracked or broken.
  • the case main body 13 has a rectangular flat plate-like bottom wall 13a having a pair of long sides and a pair of short sides, and a square cylindrical peripheral wall 13b extending from the four sides of the bottom wall 13a.
  • the peripheral wall 13b includes a long side wall 131b extending from each of the long sides of the bottom wall 13a and a short side wall 132b extending from each of the short sides of the bottom wall 13a. Then, both end surfaces of the electrode assembly 12 in the stacking direction W are opposed to the inner surface of the long side wall 131b of the case main body 13, respectively.
  • the extending direction Z of the case 11 is a direction orthogonal to the bottom wall 13a of the case body 13 and connecting the bottom wall 13a and the lid body 14 with the shortest distance.
  • the case body 13 includes a case side mating surface 13 c that abuts the lid body 14 on the opening end surface of the peripheral wall 13 b surrounding the opening S, and the case side mating surface 13 c supports the lid body 14.
  • the case side mating surface 13c is a flat surface that is orthogonal to the extending direction Z of the case 11 and is parallel to the bottom wall 13a.
  • the inner peripheral surface 13 e and the outer peripheral surface 13 d of the peripheral wall 13 b are orthogonal to the case side mating surface 13 c and extend in parallel to the extending direction Z of the case 11.
  • a dimension of a straight line connecting the inner peripheral surface 13e and the outer peripheral surface 13d with the shortest distance is defined as a thickness D1 of the peripheral wall 13b.
  • the thickness direction of the peripheral wall 13b is parallel to the bottom wall 13a.
  • the dimension in the extending direction Z of the case 11 is the thickness D of the lid body 14.
  • the lid body 14 has a rectangular flat plate shape.
  • the lid body 14 includes an outer end surface 14 a exposed to the outside in the extending direction Z of the case 11 and an inner end surface 14 b exposed to the inside of the case 11.
  • the lid 14 includes a rectangular plate-shaped insertion portion 23 and a flange portion 22 that surrounds the insertion portion 23, and the insertion portion 23 projects from the flange portion 22 toward the bottom wall 13 a of the case main body 13.
  • the outer peripheral surface of the flange portion 22 forms the outer peripheral surface 22 b of the lid body 14.
  • the thickness D of the lid 14 is the sum of the thickness of the flange portion 22 and the thickness of the insertion portion 23.
  • the thickness D of the lid body 14 is a linear dimension that connects the outer end surface 14a and the inner end surface 14b of the insertion portion 23 with the shortest distance. Therefore, the thickness D of the lid body 14 is thicker than the thickness D2 of the flange portion 22. Further, the thickness D2 of the flange portion 22 is thicker than the thickness D1 of the peripheral wall 13b. Therefore, the following formula is established.
  • the insert portion 23 of the lid body 14 is inserted into a region surrounded by the peripheral wall 13b, and the flange portion 22 of the lid body 14 is supported by the case side mating surface 13c of the peripheral wall 13b.
  • the part located in the flange part 22 among the inner end surfaces 14b of the lid body 14 constitutes the lid body side mating surface 22a facing the case side mating surface 13c.
  • the lid-side mating surface 22a has a flat surface shape orthogonal to the extending direction Z and parallel to the bottom wall 13a.
  • the case 11 includes a butting portion 31 that is a portion where the case-side mating surface 13c and the lid-side mating surface 22a are butted together.
  • the case 11 includes a welded portion 32 at the butt portion 31.
  • the welded portion 32 exists in the butting portion 31 over the entire circumferential direction of the case 11, and exists over the entire circumferential direction of the case 11.
  • the case body 13 and the lid body 14 are integrated at the butting portion 31 by being joined from the outer surface side of the case 11 by laser welding.
  • laser welding is performed using a YAG laser beam (YAG: yttrium, aluminum, garnet), and is performed by continuous oscillation (CW) that continuously outputs a laser.
  • the laser beam has a laser spot diameter of 0.8 to 1 mm, a laser output of 2 to 5 kW, and a laser output speed of 1 to 3 m / min. Weld.
  • the weld portion 32 includes a first edge 32 b exposed from the outer surface (specifically, the outer peripheral surface 22 b) of the lid body 14, and the case body 13. And the second edge 32c exposed from the outer surface (specifically, the outer peripheral surface 13d of the peripheral wall 13b).
  • the first edge 32b is an edge portion closer to the outer end face 14a of the lid body 14, and the second edge 32c is an edge closer to the bottom wall 13a of the case body 13 (the one farther from the outer end face 14a of the lid body 14).
  • the welded portion 32 has an interface 32a extending between the first edge 32b and the second edge 32c.
  • the interface 32 a of the welded portion 32 exists at the boundary between the welded portion 32 and the case 11.
  • the welded portion 32 has a semicircular shape, specifically, a semi-elliptical shape that is long in the extending direction Z. That is, the interface 32a of the welded portion 32 has an arc shape that curves from the first edge 32b and the second edge 32c toward the case side mating surface 13c and the lid side mating surface 22a.
  • the interface 32a of the welded portion 32 has a shape that is farthest from the outer peripheral surface 13d of the peripheral wall 13b and the outer peripheral surface 22b of the flange portion 22 in the vicinity of the case-side mating surface 13c and the lid-side mating surface 22a. It is located at the butting portion 31 (the boundary between the case-side mating surface 13c and the lid-side mating surface 22a).
  • the welded portion 32 is a semi-elliptical shape that is long in the extending direction Z, and the vertex P of the interface 32 a is Located at the butting portion 31.
  • the surface of the welded portion 32 exposed from the outer surface of the case 11 is continuous with the outer peripheral surface 13 d of the case body 13 and the outer peripheral surface 22 b of the flange portion 22.
  • the tangent L passing through the apex P of the interface 32a and extending in the extending direction Z of the case 11 is perpendicular to the case side mating surface 13c and the lid side mating surface 22a.
  • the welded portion 32 is perpendicular to the case-side mating surface 13 c and the lid-side mating surface 22 a in a portion passing through the abutting portion 31.
  • a direction along the case side mating surface 13c and the lid side mating surface 22a is defined as a surface direction.
  • the surface direction is also the thickness direction of the peripheral wall 13b.
  • the maximum dimension from the surface of the welded portion 32 to the interface 32a is defined as a welding depth X.
  • the welding depth X of the welded portion 32 is a dimension at the boundary portion between the case side mating surface 13c and the lid side mating surface 22a.
  • the weld depth 32 of the welded portion 32 is longer than 1/2 of the thickness D1 of the peripheral wall 13b, and the welded portion 32 is formed using a dimension that exceeds half of the thickness of the peripheral wall 13b.
  • the direction along the surface of the welded portion 32 exposed from the outer surface of the case 11 (in other words, the direction along the outer peripheral surface 13d of the case body 13 and the outer peripheral surface 22b of the flange portion 22 or the extending direction Z of the case 11).
  • Direction the dimension from the abutting portion 31 (boundary of the case side mating surface 13c and the lid side mating surface 22a) to the first edge 32b, or the butting portion 31 (boundary of the case side mating surface 13c and the lid side mating surface 22a).
  • To the second edge 32c is a welding width Y.
  • the dimension from the butt portion 31 to the first edge 32b is the welding width Y.
  • matching part 31 to the 1st edge 32b is equal to the dimension from the butt
  • FIG. 3B shows a welded portion 32 of a comparative example.
  • the welding part 32 of this comparative example has the same welding depth X as this embodiment, and the welding width Y shorter than this embodiment.
  • the length of the interface 32a of the present embodiment is larger than the length of the interface 32a of the comparative example.
  • the laser spot diameter is 0.6 mm
  • the laser output is 2 to 5 kW
  • the laser output speed is 0.5 m / min.
  • the power storage module 30 has a plurality of the secondary batteries 10 described above.
  • the plurality of secondary batteries 10 are arranged in a line.
  • the long side walls 131b of the adjacent secondary batteries 10 are opposed to each other in the arrangement direction of the secondary batteries 10.
  • the power storage module 30 has a pair of restraining plates 41 that sandwich the secondary batteries 10 from both sides in the arrangement direction of the secondary batteries 10, and a restraining load is applied to each secondary battery 10 through the restraining plates 41.
  • the restraint plate 41 is made of metal.
  • the restraint plate 41 is located on the outer side in the arrangement direction of the secondary batteries 10 located on the outermost side among the plurality of secondary batteries 10 arranged, and functions as an end plate.
  • each secondary battery 10 is constrained in the stacking direction W. Due to this restraint, a restraint load is applied to the long side wall 131b of the case body 13 in each secondary battery 10, and each electrode assembly 12 is loaded from the stacking direction W through the long side wall 131b.
  • the welded portion 32 of the case 11 is configured over the entire circumferential direction of the case 11 in a state where Y / X> 1 with respect to the welding depth X and the welding width Y. For this reason, compared with the case where the welding part 32 is comprised so that Y / X> 1 may not be satisfied, the length of the interface 32a in the cross sectional view along the extending direction Z of the case 11 can be lengthened. As a result, when a load is applied to the welded part 32, the load per unit area applied to the welded part 32 can be reduced, and the strength of the welded part 32 can be increased.
  • the electrode assembly 12 is repeatedly expanded and contracted in the stacking direction W of the electrode assembly 12 in the case 11, so that even if stress is repeatedly generated in the weld portion 32, the weld portion 32 is not peeled off from the case 11.
  • the weld 32 is not easily damaged.
  • the welded portion 32 is not sheared from the interface 32 a, and the welded portion 32 is not easily damaged.
  • strength of the welding part 32 can be raised in any place of the circumferential direction.
  • the welding depth X of the present embodiment is set at the boundary portion between the case side mating surface 13c and the lid side mating surface 22a.
  • the interface 32 a of the welded portion 32 is perpendicular to the case-side mating surface 13 c and the lid-side mating surface 22 a in a portion passing through the abutting portion 31.
  • the tangent L of the interface 32a at a position corresponding to the abutting portion 31 is perpendicular to the case side mating surface 13c and the lid side mating surface 22a.
  • the strength of the welded portion 32 can be increased by suppressing the welding width Y from being shortened by making the welded portion 32 long in the extending direction Z in a cross-sectional view along the extending direction Z.
  • the welded portion 32 is semi-elliptical, and the dimension in the extending direction Z is in the surface direction of the case side mating surface 13c and the lid side mating surface 22a. Greater than dimensions. For this reason, in a cross-sectional view along the extending direction Z, the welded portion 32 can be formed in a shape that is long in the extending direction Z, the length of the interface 32a can be increased, and the strength of the welded portion 32 can be increased.
  • the welded portion 32 is formed by irradiating laser from the outer peripheral surface of the peripheral wall 13b and the lid body 14. For this reason, the surface of the welding part 32 is exposed from the outer peripheral surface 13d of the peripheral wall 13b and the outer peripheral surface 22b of the flange part 22 in the lid body 14. Further, the thickness D of the lid body 14 is thicker than the thickness D1 of the peripheral wall 13b, and more specifically, the thickness D2 of the flange portion 22 of the lid body 14 is thicker than the thickness D1 of the peripheral wall 13b.
  • the weld depth X of the weld portion 32 is a dimension in the thickness direction of the peripheral wall 13b, and the weld depth X is limited by the thickness of the peripheral wall 13b.
  • the weld width Y of the welded portion 32 can be secured longer in the extending direction Z of the case 11 by making the thickness D2 of the flange portion 22 in the lid body 14 thicker than the thickness D1 of the peripheral wall 13b, the thickness of the peripheral wall 13b is increased. Sufficient welding strength can be secured without increasing the thickness. For this reason, the energy density of the secondary battery 10 is not reduced by increasing the thickness of the peripheral wall 13b.
  • the power storage module 30 has a plurality of secondary batteries 10 arranged in a row and restrained in the same direction by a pair of restraining plates 41. That is, the electrode assembly 12 of the secondary battery 10 is constrained in the stacking direction W of the electrode assembly 12. For this reason, even if the electrode assembly 12 expands and contracts in the stacking direction W due to charging / discharging of the electrode assembly 12, the welded portion 32 is stressed in the stacking direction W due to the restraint by the restraint plate 41. It is hard to generate
  • the welding width Y is secured along the extending direction Z of the case 11 and the interface 32a is also secured long in the extending direction Z, the strength of the welded portion 32 is increased in the extending direction Z of the case 11.
  • the welded portion 32 is less likely to be damaged due to the force (shearing force) in the extending direction Z. Therefore, it is preferable to apply the welded portion 32 in which the interface 32a is long in the extending direction Z to the welded portion 32 formed by lateral strike.
  • the thickness D of the lid body 14 and the thickness D2 of the flange portion 22 are thicker than the thickness D1 of the peripheral wall 13b.
  • the lid body 14 since the lid body 14 includes the pressure release valve 17 therein, the lid body 14 has a predetermined thickness for forming the pressure release valve 17. For this reason, the lid body 14 has a shape suitable for ensuring a welding width Y larger than the welding depth X. Therefore, the lid 14 having the pressure release valve 17 is suitable for forming the welded portion 32 so as to satisfy Y / X> 1.
  • the lid body 54 has a flat plate shape without the flange portion 22 and has a size that can be fitted inside the peripheral wall 13 b of the case body 13.
  • the thickness D of the lid 54 is longer than the thickness D1 of the peripheral wall 13b, and D> D1 is established. Then, the lid body 54 is fitted inside the peripheral wall 13 b of the case body 13.
  • the peripheral wall 13b has a case-side mating surface 13f on its inner peripheral surface
  • the lid 54 has a lid-side mating surface 54a on its outer peripheral surface.
  • the welding part 56 is formed in the butt
  • the welded portion 56 exists across the opening end surface of the case body 13 and the outer end surface 14a of the lid body 54. Further, the welded portion 56 exists over the entire circumferential direction of the case 11.
  • the welded portion 56 in a cross-sectional view along the extending direction Z of the case 11, has a first edge 56 b exposed from the outer end surface 14 a of the lid body 54, and a second edge exposed from the opening end surface of the case body 13. It has an edge 56c.
  • the welded portion 56 In a cross-sectional view along the extending direction Z of the case 11, the welded portion 56 has an interface 56a extending between the first edge 56b and the second edge 56c. The interface 56 a of the welded portion 56 exists at the boundary between the welded portion 56 and the case 11.
  • the interface 56a of the welded portion 56 has a semi-elliptical shape that is long in the thickness direction of the peripheral wall 13b.
  • the interface 56a of the welded portion 56 is curved in an arc shape from the first edge 56b and the second edge 56c toward the case side mating surface 13f and the lid body side mating surface 54a.
  • the interface 56a of the welded portion 56 is shaped to be farthest from the outer end surface 14a of the lid 54 and the opening end surface of the case body 13 in the vicinity of the lid-side mating surface 54a and the case-side mating surface 13f, and the vertex P of the interface 56a.
  • the welding depth X is the maximum dimension from the surface of the welded portion 56 to the interface 56 a in the extending direction Z of the case 11.
  • the welding width Y and the length of the interface 56a can be increased along the stacking direction W of the electrode assembly 12, and welding is performed with respect to the load in the stacking direction W of the electrode assembly 12.
  • the strength of the portion 56 can be increased.
  • the shape of the interfaces 32a and 56a of the welded portions 32 and 56 satisfies the equation of Y / X> 1. If necessary, it may be changed as appropriate.
  • the tangent line L passing through the vertex P of the interfaces 32a and 56a may not be perpendicular to the lid-side mating surfaces 22a and 54a and the case-side mating surfaces 13c and 13f, and the interfaces 32a and 56a are not arcuate.
  • the shape may be gently curved.
  • the lid body 14 may not be provided with the insertion portion 23 and may be a flat plate shape.
  • the lid body 14 may have a lid body side mating surface 22 a on the outer peripheral portion of the inner end surface 14 b, and the lid body side mating surface 22 a may be butted against the case side mating surface 13 c of the case body 13.
  • the thickness D of the lid body 14 is thicker than the thickness D1 of the peripheral wall 13b, and the formula D> D1 is established.
  • the welded portion 32 may not be semi-elliptical in a cross-sectional view along the extending direction Z of the case 11.
  • the welded portion 32 includes a weld width Y1 that is a dimension from the abutting portion 31 to the first edge 32 b in the extending direction Z, and a abutting portion 31 in the extending direction Z.
  • the welding width Y2 that is the dimension up to the second edge 32c may be different from each other.
  • both the welding widths Y1 and Y2 are longer than the welding depth X.
  • the interface 32 a of the welded portion 32 faces the butted portion 31 inward of the case 11 in the surface direction (thickness direction of the peripheral wall 13 b). It may extend to a position beyond that.
  • the welding depth X is a dimension from the surface of the welded portion 32 to the interface 32 a located closer to the inside of the case 11 than the butted portion 31.
  • the shape of the interface 32a of the welded portion 32 satisfies the expressions of Y1 / X> 1 and Y2 / X> 1.
  • the weld depth X of the welded portion 32 may not be the dimension at the boundary portion between the case side mating surface 13c and the lid side mating surface 22a.
  • the welding depth X may be a dimension at a portion closer to the outer end surface 14a of the lid body 14 than a boundary portion between the case side mating surface 13c and the lid body side mating surface 22a.
  • the welding depth X may be the dimension in the site
  • the case side mating surface 13c and the lid side mating surface 22a are not orthogonal to the extending direction Z of the case 11, and the extending direction It may be a flat surface inclined with respect to a plane orthogonal to the plane.
  • the welding depth X is the maximum dimension from the surface of the welded portion 32 to the interface 32a in the thickness direction of the peripheral wall 13b.
  • the case side mating surface 13c and the lid side mating surface 22a are not orthogonal to the extending direction Z of the case 11, and the extending direction It may be a flat surface inclined with respect to a plane orthogonal to the plane. And in the site
  • the electrode assembly 12 is not limited to the laminated type, but may be a wound type in which a belt-like positive electrode and a belt-like negative electrode are wound and laminated in layers. In the case of a wound electrode assembly, the direction in which the flat surfaces overlap is the stacking direction of the electrode assemblies.
  • the tube shape of the case body 13 may be a shape other than a square tube, and may be a cylindrical shape or a hexagonal tube shape.
  • the shapes of the lid bodies 14 and 54 are also changed in accordance with the cylindrical shape of the case body 13.
  • the secondary battery 10 is a lithium ion secondary battery, but is not limited thereto, and may be another secondary battery. In short, any ion may be used as long as ions move between the positive electrode active material layer and the negative electrode active material layer and transfer charge.
  • Each of the above embodiments may be applied to a capacitor as a power storage device.
  • D thickness of lid
  • D1 thickness of peripheral wall
  • S opening
  • W stacking direction
  • X welding depth
  • Z extending direction
  • 10 secondary battery

Abstract

Selon l'invention, une enveloppe de dispositif de stockage d'électricité possède : un corps principal d'enveloppe tubulaire possédant une paroi fond et une partie ouverture ; et un corps de couvercle fermant la partie ouverture. Cette enveloppe possède : au niveau du corps principal d'enveloppe, une face ajustement côté enveloppe en contact avec le corps de couvercle ; au niveau du corps de couvercle, une face ajustement côté corps de couvercle en vis-à-vis avec la face ajustement côté enveloppe ; et une partie soudage au niveau d'une partie ajustement bout à bout consistant en une portion d'ajustement bout à bout de la face ajustement côté enveloppe et la face ajustement côté corps de couvercle. Lorsque la direction reliant par la distance la plus courte la paroi fond et le corps de couvercle du corps principal d'enveloppe, constitue une direction de prolongement de l'enveloppe, la partie soudage possède une interface présente à la limite entre le corps principal d'enveloppe et le corps de couvercle, selon une vue transversale de l'enveloppe suivant la direction de prolongement. Lorsque la dimension maximale de la surface à l'interface de la partie soudage exposée par une face externe de l'enveloppe, constitue une profondeur de soudage (X), et lorsque dans une direction suivant la surface de la partie soudage exposée par la face externe de l'enveloppe, la dimension de la partie ajustement bout à bout à une partie bord de la partie soudage, constitue une largeur de soudage Y, la partie soudage est configurée de manière à se trouver sur l'ensemble de la direction périphérique de l'enveloppe dans un état satisfaisant la formule suivante Ｙ／Ｘ＞１.
PCT/JP2016/076155 2015-11-09 2016-09-06 Dispositif de stockage d'électricité WO2017081917A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US15/774,215 US20180331331A1 (en) 2015-11-09 2016-09-06 Electrical storage device
DE112016005140.9T DE112016005140B4 (de) 2015-11-09 2016-09-06 Elektrische Speichervorrichtung
CN201680065077.4A CN108352465A (zh) 2015-11-09 2016-09-06 蓄电装置
JP2017550010A JP6760302B2 (ja) 2015-11-09 2016-09-06 蓄電装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/JP2015/081449 WO2017081719A1 (fr) 2015-11-09 2015-11-09 Dispositif de stockage d'électricité
JPPCT/JP2015/081449 2015-11-09

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WO2017081917A1 true WO2017081917A1 (fr) 2017-05-18

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PCT/JP2016/076155 WO2017081917A1 (fr) 2015-11-09 2016-09-06 Dispositif de stockage d'électricité

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JP (1) JP6760302B2 (fr)
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WO (2) WO2017081719A1 (fr)

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EP3260705A4 (fr) * 2015-02-16 2018-11-14 Tadano Ltd. Vérin, dispositif de vérin, et engin de chantier
CN112072014A (zh) * 2020-09-16 2020-12-11 珠海冠宇电池股份有限公司 扣式电池及其电子产品
KR20230109949A (ko) * 2022-01-14 2023-07-21 삼성에스디아이 주식회사 이차전지
CN117638336B (zh) * 2024-01-24 2024-04-12 蜂巢能源科技股份有限公司 电池外壳及动力电池

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JPWO2017081917A1 (ja) 2018-09-13
DE112016005140T5 (de) 2018-07-26
CN108352465A (zh) 2018-07-31
JP6760302B2 (ja) 2020-09-23
US20180331331A1 (en) 2018-11-15
DE112016005140B4 (de) 2019-10-02
WO2017081719A1 (fr) 2017-05-18

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